Valve mechanism.



PATENTED OCT: 1', 1907.

E. H; HOLMES. VALVE MECHANISM.

APPLICATION FILED AUG.30,1906.

2 BHEETS-SHEET l.

II I II I I\ I/VVENT; W BY w? v WITNESSES A TTORNEX;

No. 867,273. PATENYTED 0c'r.'1 1907.

E. H. HOLMES.

VALVE MECHANISM.

APPLICATION FILED AUG.30,1905.

2 SHEETS-SHEET 2.

WITNESSES INVENTOR A TTORNEYQ .ns mamas PETERS co., WASHINGTON. n. c.

ERNEST HUGO HOLMES, OF MILWAUKEE, WISCONSIN.

VALVE MECHANISM.

Specification of Letters Patent.

Patented Oct. 1, 1907.

Application filed August 30, 1905. Serial No. 276,357-

The object of this invention is to provide a form of construction inwhich the supply of explosive fluid may be regulated by an ordinarygovernor through the medium of a cut off valve.

In the following description, reference is had to the accompanyingdrawings in which, 7

Figure 1 is a vertical, sectional view of a valve and a portion of thecylinder of an internal combustion engine, drawn on the axis of theinlet port and showing also the valve actuating mechanism in itsrelation to the cam shaft of the engine. Fig. 2 is a plan view of thesame. Fig. 3 is an elevation in detail of the cam actuated connectionsas seen from the direction of the cylinder, the valve stems being shownin cross section. Like parts are identified by the same referencecharacters throughout the several views. 1 is a portion of the cylinderof a gas engine, 2 is valve casing for the inlet port, and 3 is a mainvalve provided with a stem 4 which extends longitudinally through thecasing and is actuated to close the valve 3 by means of a spring 6. Thestem 4 is provided with a cap 8 which is movably seated in the springsocket 9, with the spring interposed between the cap and the head of thevalve casing. The valve 3 is opened by means of a cam 10 The valvecasing is provided with an air inlet passage 15 and a gas inlet passage16, preferably annular in form, and arranged in communication with airand gas admission ducts not shown in the drawing. The admission of airand gas through these passages 15 and 16 is controlled by a multi-seatedpuppet valve 19, which is provided with actuating stems 20, one on eachside of the stem 4, which extends axially through the valve 19 as bestshownin Fig. 1.

The stems 20 are connected with a cross head 21 which is actuated fromthe main shaft by a cam wheel 25 through the lever 26, which is pivotedat 27 to any suitable support and connected with the'cross head at itsupper end.

is curved and provided with a slot 28, curved substantially inconformity with the curve of the contact inargin of the cam projection30 on the cam wheel 25. A bearing block 31 is movably mounted in theslot 28 and is provided with a roller 32 which is adapted to bear uponthe margin of the wheel 25 as shown. When the block 31 is at the lowerend of the slot, the roller is in constant contact with the cam wheel25, but when shifted to the upper end of the slot, it is at a greaterradial distance from the center of the wheel, and out of contact withits margin, except when in registry with the higher portions of the camprojections 30. In the construction shown, the cam projection and motiontransmitting connections are arranged to open the valve 19 outwardly.The valve 19 closes inwardly by reaction of springs 35 when the camprojection clears the roller 32 on the actuating lever 26. The springs35 are located between fixed projections 36 on the casing and shoulders37 on the valve stems. A rock shaft 39 is provided with an arm 40,connected by one or more links 41 with the journal block 31 of theroller 32,

whereby a rocking movement of the shaft is communi- The cam projection30 is preferably of such dimensions that when the roller 32 is at thelower end of slot 28, the valve 19 will be opened during the entiresuction stroke, 1'. e., the same interval as that of the valve 3. As thespeed increases beyond normal limits, the

operation of the governor weights oscillates the shaft 39 through thebar 45 and arm 46 to shift the roller 32 in the slot 28 and shorten theinterval by increasing the radial distance of roller 32 from the axis ofwheel 25 and thus lessening the interval during which lever 26 will beactuated by the cam projection and correspondingly shortening theinterval of gas and air admission.

Owing to the fact that the roller 32 is shifted in the oppositedirection from that of cam wheel movement, and in an arc. correspondingwith that of the cam projection, the opening movement of valve 19 willalways takeplace simultaneously with that of the valve 3, but theadmission of themixture will be cut off prior to the closing of thevalve 3 when the roller 32 is at the upper end of the slot, since thetime of clearance of the cam projection is thus advanced incorrespondence to ,the distance the roller has been shifted from normalposition.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is:

1. The combination with a valve, of a valve actuating lever and arotary, lever-actuating cam; said lever being provided with a movabledevice arranged for contact with the cam;.and means for shifting saiddevice along the lever in an arc of increasing radius from the cam axisand corresponding in curvature substantially to that of the contactingsurface of the cam projection.

2. The combination with a valve, of a valve actuating lever, and arotary, lever-actuating cam; a device mov ably mounted on said lever,adapted for motion receiving contact with the cam; a governing shaft,and means for transmitting motion from the governing shaft to shift saiddevice along said lever in a curved line eccentric to the cam axis tovary the interval of motion receiving contact.

3. The combination with the main inlet valve of a gas engine cylinder;of an auxiliary cut off valve, controlling the admission of air or gasthereto; a lever for actuating the auxiliary valve in one direction; acam in operative relation to said lever; a motion receiving devicemounted on the lever and movable substantially in the arc of thecontacting surface of the cam projection and eccentric to the cam axis;and governing mechanism for shifting the motion receiving device.

4. The combination with the inlet passage of a gas engine cylinder, of avalve therefor a valve actuating lever a lever actuating cum; a motionreceiving device arranged to transmit motion from the cam to the lever;and :1 gm"- erning device arranged to move the motion receiving (le vicealong said lever in a direction to increase or deem so its distance fromthe axis of cam rotation and to shift it from one cam radius to another,substantially for the purpose set forth.

In testimony whereof I aflix my signature in the pres ence of twowitnesses.

ERNEST HUGO HOLMES.

Witnesses CHAS. B. Pnnnv. LEvEnE'r'r C WHEELER.

